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我正在尝试将 aReaderWriterLock用于两个之间的共享资源Tasks。由于某种原因,它开始无限期地等待:

class State {

        private const int TIMEOUT = 5000;
        private ReaderWriterLock lck = new ReaderWriterLock();
        private TimeSpan lastIssuedAt;

        public TimeSpan LastIssuedAt {
            get {

                this.lck.AcquireReaderLock(TIMEOUT);
                return this.lastIssuedAt;
            }
            set {
                this.lck.AcquireWriterLock(TIMEOUT);
                this.lastIssuedAt = value;
            }
        }
}

当一项任务尝试访问get该属性LastIssuedAt时,它只会阻塞,我不明白为什么。

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1 回答 1

1

看看 MSDN 上的例子:https ://docs.microsoft.com/en-us/dotnet/api/system.threading.readerwriterlock?view=netframework-4.8

你忘了释放锁。这样做的一个常见模式是 try/finally:

ReaderWriterLock lck = new ReaderWriterLock();

lck.AcquireReaderLock(timeOut);
try
{
    // Do what needs to be done under the lock
}
finally 
{
    // Ensure that the lock is released.
    lck.ReleaseReaderLock();
}

另外,请查看 ReaderWriterLockSlim:https ://docs.microsoft.com/en-us/dotnet/api/system.threading.readerwriterlockslim?view=netframework-4.8 MSDN 推荐的新开发。

于 2019-05-06T16:18:53.923 回答